Preliminary Product Information Photoflash Capacitor Charger Feature 2
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AT1455
Preliminary Product Information Photoflash Capacitor Charger Feature 2.5V 5.5V Supply Voltage Operating
Range. Current Consumption:1mA operation. Adjustable Output Voltage. Adjustable Switch On-Time. Charge Complete Indicator. Built-in IGBT Driver. Soft-Start Circuitry. Thermal Protection Charges Size Photoflash Capacitor. Small 10-lead MSOP Package.
AT1455 charger Photoflash capacitor with soft-start function, IGBT driver igniting flash tube, adjustable output voltage adjustable switch on-time perform energy transition each charge cycle. output voltage adjusted simply changing turn ratio transformer. sensed voltage divider connecting anode rectifying diode. voltage sensing path when charging function completed maintain minimum output voltage decay. device allows user control automatic refresh rate Charge pin. While Ready signals that capacitor fully charged.
Application Digital Film Camera Flash Cell Phone Flash.
Block Diagram
READY
Reference
Output Control Block
Zsen
Vref 1.22V CHARGE Enable Block TRIGGER
Iset
DRIVER
Aimtron reserves right without notice change this circuitry specifications.
No.9,PARK AVENUE. Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/15/2006 REV:0.2 Email: service@aimtron.com.tw
AT1455
Preliminary Product Information Photoflash Capacitor Charger Configuration
Ordering Information
Part number AT1455M AT1455M_GRE Package MSOP-10 MSOP-10 Green Marking 1455 1455, Date code with bottom line
*For more marking information, contact sales representative directly
Symbol CHARGE TRIGGER ZSEN DRIVER READY ISET Description Charge enable input Comparator input IGBT Trigger signal input. Detecting transformer secondary current. Take care correct phasing transformer. Ground Power MOSFET N-channel Drain. Connect Primary transformer. Take care correct phasing transformer. IGBT Driver output. Power supply. Charge ready open drain output. resistor from Iset VBAT sets constant On-time.
No.9,PARK AVENUE. Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/15/2006 REV:0.2 Email: service@aimtron.com.tw
AT1455
Preliminary Product Information Photoflash Capacitor Charger Absolute Maximum Ratings*1
Parameter TRIGGER DRIVER CHARGE READY voltage Current Continuous power dissipation (MSOP-10,Ta=+25 Junction Temperature Lead Temperature (Soldering sec) Storage Temperature Susceptibility*2
Rated Value -0.3 +6.5 ±300 -40~125
Unit
Stresses beyond those listed under "Absolute Maximum Ratings" cause permanent damage device. These stress ratings only, functional operation device these other conditions beyond those indicated operational sections specifications implied. Exposure absolute maximum rating conditions extended periods affect device reliability. Device sensitive. Handling precaution recommended. Human Body model 100pF capacitor discharged through 1.5K resistor into each pin.
Recommended Operation Conditions
Parameter Power supply voltage Operating temperature Symbol Min. Values Typ. Max. +5.5 Unit
No.9,PARK AVENUE. Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/15/2006 REV:0.2 Email: service@aimtron.com.tw
AT1455
Preliminary Product Information Photoflash Capacitor Charger Electrical Characteristics
(VCC=3.3V, Ta=+25, unless otherwise noted)
Parameter Input operating voltage Feedback voltage Shutdown current Quiescent Current Primary side current limit Secondary side transit current Output resistor Output resistor IGBT Driver Rising time IGBT Driver Falling time IGBT Trigger signal high IGBT Trigger signal Charge input voltage high Charge input voltage Charge Bias current Ready output signal high Ready output signal Minimum time Thermal Shutdown
Symbol IOFF ILX(MAX) Zsen
Test Condition Ta=+25 CHARGE pin=GND Switching FB=1.2V
Min. 1.08
Typ. Max. Units 1.10 0.01 1.12
0.3Vcc
-15mA 15mA VCC=3.3V, CL=3900pF VCC=3.3V, CL=8200pF VCC=3.3V, CL=3900pF VCC=3.3V, CL=8200pF
0.7Vcc
VOFF VCHARGE =3.3V 100k from Ready 33µA into Ready 0.1V hysteresis Vcc0.1
No.9,PARK AVENUE. Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/15/2006 REV:0.2 Email: service@aimtron.com.tw
AT1455
Preliminary Product Information Photoflash Capacitor Charger Timing Chart
Trige
READY
VOUT
CHARGE
Charge Timing
Power Timing
Shutdown
Charging
Toggling CHARGE Refresh
Storbe
1.uP Detected READY ->High(Charge Complete) ->allow enter refresh mode strobe tube 2.Use delay Photoflash Capacitor self-discharge time 3.Toggling CHARGE high->low->high, force into refresh charging mode.
Charge Toggle-Refresh (Soft-ware control)Mode
No.9,PARK AVENUE. Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/15/2006 REV:0.2 Email: service@aimtron.com.tw
AT1455
Preliminary Product Information Photoflash Capacitor Charger Typical Operating Characteristics
Charging waveform without auto-refresh function Time(1 s/Div) VCC=3.3V, VBAT=4.2V, C=120uF
CH1:READY CH2:CHARGE
CH3:Output Voltage
CH4:Input Current
No.9,PARK AVENUE. Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/15/2006 REV:0.2 Email: service@aimtron.com.tw
AT1455
Preliminary Product Information Photoflash Capacitor Charger Application Circuit
No.9,PARK AVENUE. Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/15/2006 REV:0.2 Email: service@aimtron.com.tw
Preliminary Product Information Photoflash Capacitor Charger
AT1455
Short ST-532948BR 1:10 LPRI=15uH VBAT (Option 33uH)
MA2YF80
300V MA2YF80
10u/6V3*2
5.1M/1%
120u/330V
100K 190K
FSH-
TUBE AO3400 5.1M/1%
Iset
1N4007
Zsen 0.1uF
AT1455
37.4K/1%
CHARGE Charge :Enable "L":Disable READY TRIGGER DRIVER
100K
Strobe
GT5G103
READY :Charging Complete "L":Charging mode
TRIGGER IGBT Driver Input
No.9,PARK AVENUE. Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/15/2006 REV:0.2 Email: service@aimtron.com.tw
Preliminary Product Information Photoflash Capacitor Charger
AT1455
33uH(option) ST-532948BR 1:10 LPRI=15uH VBAT short
MA2YF80
300V
10u/6V3*2 100K 190K
150K/1%
120u/330V
FSH-
TUBE AO3400 150K/1%
Iset
1N4007
Zsen
100K
AT1455
1.1K/1%
CHARGE Charge :Enable "L":Disable READY TRIGGER DRIVER
Strobe
GT5G103
READY :Charging Complete "L":Charging mode
TRIGGER IGBT Driver Input
No.9,PARK AVENUE. Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/15/2006 REV:0.2 Email: service@aimtron.com.tw
AT1455
Preliminary Product Information Photoflash Capacitor Charger Application Information AT1455 designed precise control switching current charge photoflash capacitors quickly efficiently. When Charge first driven high, shot latches correct state. pull high turns external power MOSFET primary current ramps linearly according VBAT primary inductance. Comparator monitors switch On-time when switch on-time reaches limit value, pull low. During this phase, stored energy primary transformer delivered photoflash capacitor secondary diode. secondary current decreased linearly rate determined secondary inductance. secondary current monitored Zsen pin. When secondary current drops below 10mA, fires shot will turn extreal MOSFET. charging cycle repeats deliver power output. AT1455 adjust external resistance Iset N-MOS switch on-time, switch on-time value must match with electrical characteristic transformer. usually equal less than saturation current transformer otherwise transformer will saturated. Therefore, efficiency will reduced. output voltage detected voltage divider connecting output capacitor. When output voltage reaches desired voltage resistive voltage-divider, comparator output goes high which resets master latch disable charging block. N-channel MOSFET turned pulling Ready high, indicating that part finished charging. Power delivery only restarted toggling Charge pin. Charge gives full control part user. IGBT buffer will provide sufficient current drive IGBT ignite flash tube. Transformer Design Fly-back transformer element AT145. must designed carefully checked that does cause excessive current voltage part. first transformer parameter that needs turns ratio should high enough that absolute maximum voltage rating NMOS drain source voltage exceeded. Choose minimum turns ratio according following formula: VOUT Vout: Target Output Voltage VDS(MAX):Maximum drain source voltage NMOS. Forward Voltage drop output Diode.
No.9,PARK AVENUE. Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/15/2006 REV:0.2 Email: service@aimtron.com.tw
AT1455
Preliminary Product Information Photoflash Capacitor Charger Adjustable Output Voltage AT1455 senses output voltage voltage divider connecting output terminal. (R8+R9) ratio determines output voltage shown application circuit Figure feedback reference voltage 1.1V. Calculate remaining resistors with following equations:
VOUT
must greater than 0805 size resistor (typical 1206) enduring secondary together need have breakdown voltage least 300V. resistor divider connected anode diode central dual diode eliminate leakage current AT1455 application circuit. Choose lower resistor connected from GND, less than larger resistor combined with parasitic capacitance would affect VOUT detection accuracy. Rectifying Diode rectifying diode should capacitance (short reverse recovery time) type with sufficient reverse recovery-voltage forward current ratings. peak reverse recovery-voltage that diode approximately: VPK-R VOUT VCC) peak current diode simply: IPK-SEC= IPK-PRI Rating 2x250V, 225mA, 2x300V, 225mA, 2x300V, 225mA, 800V, 200mA, Part Number BAV23S GSD2004S MMBD3004S MA2YF80 Manufacturer Fairchild Vishay Diode Panasonic
Primary Inductance fly-back transformer needs store substantial amounts energy core during each switching cycle. transformer will generally require gap. core makes energy storage. While power switch off, energy transferred output capacitor proportional primary inductance constant primary current. primary inductance needs equal larger than certain minimum value ensure that AT1455 adequate time respond
No.9,PARK AVENUE. Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/15/2006 REV:0.2 Email: service@aimtron.com.tw
AT1455
Preliminary Product Information Photoflash Capacitor Charger fly-back waveform. switch time should 500ns larger AT1455. minimum inductance calculated with following formula: VOUT LPRI Vout: Target Output Voltage Transformer Turns Ratio IPK-PRI: Primary Peak Current
Leakage Inductance Parasitic Capacitance leakage inductance primary transformer results first spike voltage when NMOS turns off. spike voltage proportional leakage inductance. spike voltage must exceed dynamic rating NMOS drain source voltage. important minimize leakage inductance very level. Although this would result very leakage spike, parasitic capacitance transformer will high between windings. This will result initial spike current primary becoming excessively high while NMOS turns Therefore, trade necessary between leakage inductance parasitic capacitance.
Spike Voltage @SwitchingTime(1us/Div) VLX(5V/Div) IPRI(1A/Div) Swing Current @SwitchingTime(1us/Div) VLX(10V/Div) IPRI(1A/Div)
Spike Voltage
Swing Current
CH1:VLX; CH2:Input Current
Transformer Secondary Capacitance total capacitance secondary transformer will severely affect
No.9,PARK AVENUE. Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/15/2006 REV:0.2 Email: service@aimtron.com.tw
AT1455
Preliminary Product Information Photoflash Capacitor Charger efficiency circuit. secondary capacitance multiplied when reflected primary. Since this capacitance forms resonant circuit with primary leakage inductance transformer. such, both primary leakage inductance secondary side capacitance should minimized. Adjustable Input Current AT1455 adjust N-MOS switch on-time resistor connecting Iset pin. This resistor determines primary peak current on-time primary N-MOS following equation:
VBAT VIset VBAT VIset LPRI
LPRI VBAT VBAT
where LPRI: primary inductance (µH) IPK-PRI: peak primary current recommended several grade user want control IBAT keep level even charge time gets longer when VBAT goes lower. this case, on-time constant dependent VBAT level. this, setting constant on-time resistor connected VCC.
No.9,PARK AVENUE. Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/15/2006 REV:0.2 Email: service@aimtron.com.tw
AT1455
Preliminary Product Information Photoflash Capacitor Charger another topology, connect VBAT constant on-time. On-time change dependent VBAT because battery voltage level different from full energy power.
External capacitor connected Rsense perform soft-start function reduce inrush current VBAT input current.
VBAT Short 33uH/option 10uF/6V3*2 ST-532948BR 1:10 LPRI=15uH MA2YF80 300V
100K 0.1uF
5.1M/1%
5.1M/1% Iset
AT1455
Zsen
37.4K/1%
0.1uF
CHARGE Charge :Enable "L":Disable READY :Charging Complete "L":Charging mode TRIGGER IGBT Driver Input READY TRIGGER DRIVER
Strobe
No.9,PARK AVENUE. Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/15/2006 REV:0.2 Email: service@aimtron.com.tw
AT1455
Preliminary Product Information Photoflash Capacitor Charger Prevent Leakage READY
CHARGE
READY
READY
pull-high resistor READY signal connect Charge pin, then reduce power consumption pull-high resistor READY during charge goes low.
Board Layout high voltage operation AT1455 demands careful attention board layout. will advertised performance with careless layout. Keep area high voltage secondary small possible. Also note larger than minimum spacing high voltage nodes order meet breakdown voltage requirements circuit board. Remember that lethal voltages present this circuit. caution when working with circuit.
No.9,PARK AVENUE. Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/15/2006 REV:0.2 Email: service@aimtron.com.tw
AT1455
Preliminary Product Information Photoflash Capacitor Charger Outline 10-pin MSOP
No.9,PARK AVENUE. Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/15/2006 REV:0.2 Email: service@aimtron.com.tw
AT1455
Preliminary Product Information Photoflash Capacitor Charger Reflow Profiles
Profile Feature
Average ramp-up rate Preheat -Temperature Min(Tsmin) -Temperature (Tsmax) -Time (min max)(ts) Tsmax -Ramp-up Rate Time maintained above: -Temperature (TL) -Time (tL) Peak Temperature(TP) Time within actual Peak Temperature (tP) Ramp-down Rate Time 25°C Peak Temperature
Sn-Pb Eutectic Assembly Large Body Small Body Pkg. thickness Pkg. thickness <2.5mm Pkg. 2.5mm Pkg. volume <350mm3 volume 350mm 3°C/second max.
Pb-Free Assembly Large Body Small Body Pkg. thickness Pkg. thickness <2.5mm Pkg. 2.5mm Pkg. volume <350mm3 volume 350mm 3°C/second max.
100°C 150°C 60-120 seconds
150°C 200°C 60-180 seconds 3°C/second max.
183°C 60-150 seconds 225+0/-5°C 10-30 seconds 240+0/-5°C 10-30 seconds
217°C 60-150 seconds 245+0/-5°C 10-30 seconds 250+0/-5°C 20-40 seconds
6°C/second max. minutes max.
6°C/second max. minutes max.
*All temperatures refer topside package, measured package body surface.
No.9,PARK AVENUE. Science-Based Industrial Park, Hsinchu 300,Taiwan, R.O.C. Tel: 886-3-563-0878 Fax: 886-3-563-0879 WWW: http://www.aimtron.com.tw 12/15/2006 REV:0.2 Email: service@aimtron.com.tw
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